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The main causes of LED damage are:

Update:19 Jul 2019
Summary:

1 Sudden rise in the supply voltage. 2 A short circuit […]

1 Sudden rise in the supply voltage.

2 A short circuit of a component or printed wiring or other conductor in the line forms a partial short circuit of the LED power supply path, causing the voltage in this place to increase.

3 A certain LED is damaged due to its own quality, thus forming a short circuit, and its original voltage drop is transferred to other LEDs.

4 The temperature inside the lamp is too high, which deteriorates the characteristics of the LED.

5 The inside of the lamp is filled with water, and the water is electrically conductive.

6 At the time of assembly, there is no anti-static work, so that the inside of the LED has been damaged by static electricity. Despite the application of normal voltage and current values, it is extremely easy to cause damage to the LED.